/ Link showing page number
  - available local variables
    page         : a page object for "this" page
    url          : url to this page
    current_page : a page object for the currently displayed page
    total_pages  : total number of pages
    per_page     : number of items to fetch per page
    remote       : data-remote
span class="page#{' current' if page.current?}"
  == link_to_unless page.current?, page, url, {remote: remote, rel: page.rel}
'
